Sheet glass trimming device



P 1941- E. E. NORDGREN I 2,254,541

SHEET GLASS TRIMMING DEYICE Filed May 23, 1940 2 Sheets-Sheet 1.ZiZUiZi'OT' Elm erEiVordgren Sept. 2, 1941. 3 E. E. NORDGR'EN SHEETGLASS TRIMMING DEVICE I Filed May 25, 1940 2 Sheets-Sheet 2 fizen i'or lElmer E. Nom'gren A 35 30 5 his Aiiofine s 26 30 24 27 32 2% v MWPatented Sept. 2, 1941 UNHTED STATES PATENT OFFICE Claims.

My invention provides an extremely simple and highly eificient sheetglass trimming device which involves means for holding the glass sheetor plate in position for cutting, for guiding the glass cutter, and forbreaking the plate on the out line. Generally stated, the inventionconsists of the' novel devices, combinations of devices and arrangementof parts hereinafter described and defined in the claims.

The device involves a frame, which is preferably approximately L-shapedor much in the form of a carpenters square, combined with an efficientdevice for firmly clamping the glass plate, and for breaking off the cutedge or portion. The lower or horizontal portion of the frame has ashelf or ledge formed with a channel that assists in positioning theglass plate against the faces of the horizontal and vertical portions ofthe frame. The clamping device extends along the vertical portion of theframe and is guided for substantial straight line movements toward andfrom the face of the latter. Moreover, this clamping bar has a straightedge extended parallel and closely adjacent to the vertical edge of thevertical or upright portion of the frame and serves to guide the glasscutting tool along the line to be cut. The breaking device is anindependent element associated with the upright portion of the frame andthe clamping bar in a novel manner to be hereinafter more fullydescribed.

A commercial form of the device is illustrated in the accompanyingdrawings wherein like characters indicate like parts throughout theseveral views.

Referring to the drawings:

Fig. 1 is a front or face elevation of the complete device;

Fig. 2 is a horizontal section taken on the line 22 of Fig. 1, someparts being broken away;

Fig. 3 is a plan view of the device, some parts being broken away;

Fig. 4 is a bottom plan View of the device, a portion of the base orhorizontal member of the frame being broken off;

Fig. 5 is a transverse vertical section taken on the line 5-5 of Fig. 1,some parts being broken away; and

Fig. 6 is a transverse vertical section taken on the line 66 of Fig. 1,some parts being broken away.

The frame may be made of suitable materials but, preferably andconveniently, may be made of wood. It involves a horizontal bar ormember I0 and a vertical bar or member I I, which mem- 55 bers I0 and IIextend at right angles, one in respect to the other. Theglass-supporting surface of the horizontal bar Ill is formed by arigidly attached supplemental bar Illa on which the lower edge of aglass plate or pane I2 is adapted to rest in a channel I3 formed by araised ledge I4 on the outer edge of said member Illa. The upright barII, in the particular structure illustrated, is shown as provided withrigidly secured facing strips Ila and III) which function as integralparts of the said member II. This frame is adapted to be secured to awall or upright support and for that purpose is shown as provided withanchoring brackets I5, the upper bracket being rigidly secured to theupper end of the upright II by nut-equipped bolts I6, and the lowerbracket I5 being secured at the base of said upright II by anut-equipped bolt I1 shown as applied through the supplemental bar ormember Illa, as best shown in Fig. 6. Horizontal guide pins or studs I8are riveted or otherwise rigidly secured to the upper and loweranchoring brackets I5 and project through and extend beyond the uprightmember or portion I I, as best shown in Fig. 5. As will presently benoted, these pins or studs I8 afford guides for a clamping bar.

The clamping bar may take various cross-sectional form but, as shown,and preferably, is a metallic channel bar I9 having holes through whichthe guide pins I8 extend so that said clamping bar I9 will be guided forapproximately straight line movements toward and from the face of theupright frame member or bar II, For direct contact with the glass plateor pane I2, the clamping bar I9 is preferably faced with a pliable strip20 of rubber, leather or like material. In this particular structureangle brackets 2| are riveted or otherwise secured to the upper andlower ends of the clamping bar I9 and are provided with projecting studs22.

The numeral 23 indicates an upright rock shaft that is extended throughand journaled in the anchoring brackets I5. The studs 22 and theextended ends of the rock shaft 23 are connected by toggles made up oflinks 24 and 25 pivotally connected at 2B. The links 24 are welded orotherwise rigidly secured to the ends of the rock shaft 23 so that theyact as crank arms on said rock shaft; but the links 25 are pivoted onthe studs 22. The studs 22 are connected to the ends of the rock shaft23 by coiled springs 21 that exert a yielding force tending to keep thetoggles buckled, and press the facing 20 of the clamping bar against theglass plate.

For manipulating the toggles, that is, for moving the same from one sideto the other of dead centers, I provide a lever 28 pivoted to thesupplemental portion Illa of the base member or bar Ill at 29 with itsshort end connected by a link or thrust bar 30 to the intermediate jointor pivot of the lower toggle, see particularly Fig. 4. It is importantto note that when the toggles are buckled, as shown by dotted lines inFig. 4, the clamping bar l9 will be held retracted or in an inoperativeplate-releasing position, it being assumed that the lever 28 is limitedin its backward swinging position shown by dotted lines 7 in Fig. 4 by asuitable stop such as a pin or the like applied on the frame Hla.

It is now important to note, see particularly Fig. 2, that the front orstraight edge-acting portion of the clamping bar is parallel to thefrontedge or surface of the upright facing bar I la but is offset therefromslightly so as to cause the diamond or the cutting wheel of the cuttingtool to align with the face of said strip I la when the tool is drawnalong and against the said clamping bar. The dotted line y in Fig. 2in'- dicates the planeof the cutting line and also the plane of thebreaking line'on which the cut glass will'be broken. The numeral 3!indicates a graduated scale shown asset into the face of the base bar ormember ID. r

For breaking off the glass plate beyond the out line, I provide abreaker, in the form of a bail, consisting of arms 32 and a breaker bar33. The arms 32 are pivoted at 34 to offsetting lugs '35 on the extendedends of supporting bars 36. These bars-"36 are located one above and onebelow the frame structure and'are Welded or otherwise rigidly securedrespectively to the upper and lower anchoring brackets i5. By thisarrangement the'anchoring brackets l5 afford primary supports for thebreaker bail, and the arms of the breaker bail are; spread so that theywill clear the upper and lower portions of the device and permit thebail to be freely swung 1 from its normal or retracted position, shownby full lines, into itsoperative or breaking position, shown by dottedlines in Fig. 2. As shown by dotted lines in Fig. 2, the bail, whenswung to that position, will engage that portion ofthe glass pane orplate that is beyond the-cut line 1;, and'when forced slightly furtherupward than shown by dotted lines in Fig. 2, will cause the glass to bebroken on its out line.

'In'the commercial-manufacture of this device, -I found it highlydesirable to make horizontal and vertical-bars or members and H integralout of' wood that is made up of layers glued together with the grain ofthe wood'running at right angles, the one layer in respect to the"other. Such material-is generally known to the having a flat faceadapted for engagement with a glass plate, said frame having a straightouter edge serving as a straightedge and determining approximately acutting and breaking line, a clamping bar extended parallel and adjacentto said straightedge, means guiding said clamping bar for straight linemovements toward and from the face of said frame, laterally spacedtoggles each involving two pivotally connected links, one link of eachtoggle being pivoted to the adjacent end of said clamping bar and theother link of each toggle being pivoted to a fixed part of said frame,springs connecting the extended ends of the links of said toggles andtending to buckle the same, and means for simultaneously moving saidtoggles from one side to the other of dead centers.

2. In a device of the kind described, a frame having a flat face adaptedfor engagement with a glass plate, said frame having a straight outeredge serving as a straightedge and determining approximately a cutting.and breaking line, a clamping bar extended parallel and adjacent to saidstraightedge, guidepins fixed to said frame and projecting throughpassages in the end portions of said clamping bar and guiding the latterfor straight line movements toward andfrom the face of said frame, saidclamping bar having a flat clamping bar. that is held parallel to theface of said frame, laterally spaced toggles each involving twopivotally connected links, one link of each toggle being pivoted to theadjacent end of said clamping bar and the other link of each togglebeing pivoted to a fixed part of said frame, springs connecting'theextended ends of the links of said toggles and tending to buckle thesame,

and-means for simultaneously moving said toggles, from one side to theother of dead centers. 3. The structure defined in claim 2 in which thelinks of said toggles that are pivotally connected to a fixed part ofsaid frame are rigidly secured to a rock shaft.

4. The structure defined'in claim 2 in which the links of said togglesthat are pivotally connected to a fixed part of said frame-are rigidlysecured to a rock shaft, the means for buckling said toggles including athrust =bar pivotally connectedto the/intermediate joint of one of saidtoggles.

5. In a device of the kind described, a frame having a fiat face adaptedfor engagement with a glass plate, said frame having a straight outerjedgeserving as a straightedge and determining approximately 'a cuttingand breaking line, a

clampingbar extended parallel and adjacentto 'said straightedge, meansguiding said clamping bar for straight linemovementstoward and from theface of said frexne,-laterallyispaced toggles each involving twopivotally connectedlinks, one link of each'toggle being pivoted t'o'theadjacent end of said clamping bar and the other link of each'toggleb'eing pivoted to a fixed part ,of'said frame, yielding meanstending to buckle said toggles, and mean's for simultaneously movingsaid'toggles from one side to the other of dead centers.

- ELMER E. NORDGREN.

